Re: [Emc-users] tuning question

[Chris R. <ch...@ti...>]

On Tue, Oct 12, 2010 at 08:20:59AM -0500, Stuart Stevenson wrote:

> that tweak is very slight - I have been putting a little twist pressure on
> the pot and can only get it to jump from one side of zero to the other - the
> point of diminishing returns is looming close - it is possible I may have to
> just live with a .0001-2 offset - oh bother :)

DEADBAND =                         1e-04

This is why - you have deadband of 2.5 encoder counts.  You will
always settle on one side of it or the other.  Set deadband to zero
and you will be able to balance it.  I don't think deadband is useful
in velocity mode.  You will always get dithering between adjacent
counts - deadband just makes it dither across a bigger discontinuity.

Chris